A Novel Concept of the "Standard Human" in the Assessment of Individual Total Heart Size: Lessons from...

Area of Science:

• Cardiology
• Medical Imaging
• Biometrics

Background:

• Retrospective observational study of 2305 individuals undergoing coronary artery calcium (CAC) scoring via cardiac CT.
• Evaluation included cardiac structures and chamber volumes beyond CAC scoring.
• Focus on developing a novel body size index for total heart volume (THV) quantification.

Purpose of the Study:

• To introduce and validate a new body size index for THV normalization.
• To assess if the novel index improves cardiovascular risk stratification compared to existing methods.
• To differentiate the impact of body weight gain from cardiovascular disease on THV.

Main Methods:

• Proposed index: height + (height - body surface area) [h+(h-BSA)].
• Analyzed THV normalized by the novel index in relation to cardiovascular risk factors.
• Compared findings across different body mass index (BMI) categories and sexes.

Main Results:

• In low cardiovascular risk subjects, normalized THV correlated with body weight gain, highest in obesity.
• High-risk features (hypertension, diabetes) resulted in larger THV than expected for body weight alone.
• Differences in THV were independent of sex across all BMI categories.

Conclusions:

• Standard body surface area (BSA) correction obscures important differences in THV.
• The proposed indexation may offer improved cardiovascular risk prognostication.
• This novel index helps differentiate body weight effects from cardiovascular disease impacts on heart volume.